JP2007114569A - Display and display apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a display having a layout structure in which, when an image relatively rotates with a prescribed center position as the rotation center, the quality of the displayed image can be enhanced, and to provide a display apparatus for displaying images by utilizing the display. <P>SOLUTION: The display 201 is constituted of display cells such as: a center displaying cell 221 existing at the prescribed center point; the first circumference to the seventh circumference displaying cells 222-228 formed by segmenting concentric circles with a straight line radially arranged from the center point; and the eighth circumference to the fourteenth circumference displaying cells 229-235 formed by further segmenting the concentric circles by adding each one straight line between the concentric circle and the straight line arranged at still outer portion. Thus, when a straight line which passes the center is displayed, lack of the display cells in the direction does not occur. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a display as a device for visually displaying various kinds of information and a display device that includes this display to display an image, and displays an image that is rotated within a certain angle range or rotated at a certain angle. The present invention relates to a display and a display device suitable for the above.

  Many display devices such as televisions, personal computer displays, mobile phone displays, and wristwatch displays are used around us. Many of such display devices include a square-shaped display having a rectangular or square screen.

  A display device having such an angular display has an advantage that it is easy to manufacture industrially. For example, in the case of a rectangular display, there is a high possibility that the display area can be cut out from a wide plate-shaped material without waste. Therefore, for example, compared with the case of cutting out a circular display, there is no useless part, and the unit price can be reduced accordingly.

  By the way, FIG. 14 shows human eyes. The eye 101 has a circular pupil 103 in the center of a so-called black eye 102 having a circular shape. The light incident from the pupil 103 is converged by a lens-like crystalline lens (not shown) disposed behind the iris constituting the black eye 102, and an image is formed on the retina (not shown). Therefore, the visual field of each human eye is not a quadrangle, but a substantially circular region. For this reason, a display device provided with a circular or near-shaped display has good compatibility with humans.

  A wristwatch exists as a typical industrial product having a circular display. When the mainstream of the wristwatch is a mechanical device, the hands for displaying the time are rotated in the dial. Due to its historical background, the display is usually circular even today when many watches are digitized. When the wristwatch is digitized and the display becomes a liquid crystal or organic EL (organic electroluminescence), some models are designed to display an image of a rotating hand such as a second hand of a mechanical wristwatch.

  However, such a conventional display has a configuration in which individual display elements (display cells) are arranged in a matrix. Accordingly, there is a problem that the thickness of a thin linear image like a second hand changes depending on the rotation position, resulting in an unnatural image display.

  FIG. 15 and FIG. 16 show examples in which the appearance of linear thin line images differs depending on the rotation angle when display cells are arranged in a matrix. In these drawings, each square divided by vertical and horizontal lines 111 and 112 represents a display cell 113. For this reason, if pixels are arranged in one direction to represent a linear thin line, the image shown in FIG. 15 in the horizontal direction is different from the image in FIG. 16 at an angle of 45 degrees. That is, in the image shown in FIG. 15, the display cells 113 constituting the thin line 114 are expressed as continuous strips without changing the thickness, whereas the image shown in FIG. The display cell 113 constituting the thin line 115 is intermittently changed periodically from zero to a specific thickness, resulting in a jagged image. That is, in a display in which display cells are arranged in a matrix, the displayed image varies greatly depending on the rotation angle.

  Therefore, instead of adopting an arrangement structure in which the display cells are squared and arranged in a matrix, it has been proposed to arrange the display cells in a regular hexagon and arrange them concentrically (for example, Patent Document 1). reference).

FIG. 17 shows a state in which the proposed display cells are combined. One display cell 121 is arranged at the center, and six first display cells 122 are arranged concentrically (ring-shaped) around the display cell 121 at the center, and the second display cell is arranged around the first display cell 122. Twelve cells 123 are arranged concentrically. The same applies hereinafter.
Japanese Patent Laid-Open No. 2002-14300 (paragraph 0017, FIG. 4).

  In the proposal shown in FIG. 17, six angular directions (straight lines) indicated by broken lines 131 to 136 that are orthogonal to any of the six sides constituting the central display cell 121 and that have the center of the display cell 121 as one end. When 131 is set to 0 degree, straight lines using display cells 121, 122, 123,... Are expressed without interruption only in directions of 0 degree, 60 degrees, 120 degrees, 180 degrees, 240 degrees, and 300 degrees. Is done. Therefore, the display cell 113 as shown in FIG. 15 has a straight line break as compared with the case where the straight line is expressed in four angular directions (0 degree, 90 degree, 180 degree, and 270 degree directions). There is an advantage that the angle to be expressed is increased. However, when a thin straight line is represented at an angle other than these, the same problem as that of the square display cell 113 occurs.

  FIG. 18 shows a part of a straight line representing the intermediate direction of the two broken lines 133 and 134 in FIG. Thus, in the direction of this example, a line segment that does not know whether it is a straight line or a dotted line even if it intends to display a straight line is expressed. Therefore, if a thin line segment is rotated on the display, the displayed image varies greatly depending on the rotation angle even when the regular hexagonal display cells 121, 122,... Shown in FIG. As a result, the quality of the image is greatly reduced.

  In the above description, a problem has been described in the case where an image composed of thin rotating line segments is displayed on a fixed display. On the contrary, even when the display is rotated, if the image is corrected so that the image in the display is always constant with respect to the horizontal, the display mode of the thin line segment image is changed according to the rotation of the display. This causes the same inconvenience that the image quality is greatly lowered. Further, the case where a straight line segment is displayed as an image has been described above. However, considering that the display mode at each display position also varies in the same way for a normal two-dimensional image, the image of the image depends on the relative rotation position. This causes a disadvantage that the quality is greatly lowered.

  Accordingly, an object of the present invention is to provide a display having an arrangement structure capable of improving the quality of a displayed image when the image is relatively rotated with a predetermined center position as a rotation center, and an image using the display. It is to provide a display device for displaying.

  In the present invention, (a) a first display cell having a radius a arranged at the center, and (b) a length b (from a position a radius a from the center of the first display cell. Assuming that concentric circles with respect to a circle with a radius a exist at respective positions in a direction away from each other by b (an arbitrary positive value), the first c outside the first display cell (c is an integer of 1 or more) ), Each ring-shaped region divided by concentric circles is divided by d straight lines (d is an integer of 2 or more) with the same angle at the center of the first display cell. A second display cell arranged individually in each section; and (c) each time e (where e is an integer of 2 or more) concentric circles, with the same spacing as the concentric circles further outside the c concentric circles. Two adjacent ones with the center of the first display cell as one end A numerical value (f + 1) is obtained by dividing the ring-shaped region between the lines by new f lines (f is an integer of 1 or more) having the same center at the first display cell at equal angles. When the number of e concentric circles and the number of sections partitioned by these straight lines are increased, the display is provided with a third display cell arranged in each increased number of sections.

  In other words, in the present invention (the invention described in claim 1), the second and third display cells are arranged radially around the first display cell having a radius a arranged at the center of the display. Here, the second display cell is individually arranged in each section divided by c concentric circles and d straight lines having the same angle between adjacent ones and having the center as one end. Yes. Further, the third display cell is arranged in each of the sections generated by dividing the concentric circles existing by e on the outside of the c concentric circles for the second display cell by the straight lines arranged radially. However, the straight line that divides the third display cell increases in units of concentric circles that exist e outside the c concentric circles for the second display cell. The state of the increase is that f lines (f is an integer of 1 or more) newly passing through the center of the first display cell through adjoining each of the d lines that delimit the second display cell. By dividing by a straight line, the number of display cells between the original two straight lines is increased by a multiple of the numerical value (f + 1). Each time the concentric circles are increased by e pieces, the e concentric circles increased immediately before the concentric circles are divided by f straight lines every two adjacent radial straight lines, and thus the outer side of the concentric circles. The number of display cells divided by a straight line increases as the distance from the line increases.

  In the present invention, (a) the display according to claim 1 and (b) display driving means for independently driving the first to third display cells of the display in accordance with image data at corresponding positions. Are provided in the display device.

  In other words, according to the present invention, each of the display cells of the display having the arrangement shown in the first aspect of the invention is driven to display corresponding to the image data, thereby enabling the display of the image data on the circular display. . If the image data is sent as a rectangular frame, the image data is displayed only on the rectangular portion of the circular display. On the other hand, if the image data is sent as a circular frame, the image can be displayed on the entire surface of the circular display.

  In the present invention, (a) the display according to claim 1, (b) rotation angle detecting means for detecting the rotation angle of the first display cell of the display, and (c) the first to first of the display. Display driving means for independently driving the three display cells in accordance with image data at corresponding positions; and (d) rotating the image data in the reverse direction by an angle corresponding to the rotation angle detected by the rotation angle detecting means. The display device is provided with image data correction means for performing correction.

  That is, in the present invention, when the display cells of the display having the arrangement structure shown in the first aspect of the present invention are displayed and driven with image data, the rotation angle of the first display cell is detected and detected. Display on the display is performed by correcting the image data in the reverse direction by an angle corresponding to the rotation angle. Therefore, for example, even if the face is tilted when the display is mounted on the head, display is performed such that the horizontal direction or vertical direction in the image data is maintained.

  In the present invention, (a) the display according to claim 1, (b) gravity direction detecting means for detecting the gravity direction of the display, and (c) first to third display cells of the display, Display driving means that is driven independently according to image data at a corresponding position, and (d) correction for rotating the image data so that the gravity direction detected by the gravity direction detecting means coincides with the gravity direction of the image data. The display device is provided with image data correction means.

  That is, in the present invention, when each of the display cells of the display having the arrangement structure shown in the first aspect of the present invention is displayed and driven by image data, the gravity direction of the display is detected, and the detected gravity direction is the image. We decided to make corrections to rotate the image data so that it matches the direction of gravity of the data. Thereby, the display is tilted in an arbitrary direction, and for example, even on a table or a desk, an image portion that should always be displayed is displayed on the top, so that it is easy to grasp the image.

  As described above, according to the present invention, display cells as display units of the display are arranged radially. Therefore, a thin line that rotates around one point like a second hand of a timepiece can be displayed with high quality regardless of the rotation angle. In particular, since the first display cell is arranged at the center of the circle, there is no possibility that the image is intermittently lost even for a line segment passing through the center. Therefore, when image processing is performed to make an image such as a straight line in a circle appear to be stationary when a straight line is rotated in the circle or on the contrary, the display can be performed with high quality. it can.

  Hereinafter, the present invention will be described in detail with reference to examples.

  FIG. 1 shows an outline of a display device according to an embodiment of the present invention. The display device 200 includes a circular display 201, a drive circuit 202 that drives the display 201, and a general video signal 203 that is externally input and converted into a dedicated signal for display on the display 200. The signal input circuit 204 is provided to the drive circuit 202.

2 and 3 exemplify the relationship between the display area of the display and the image of one frame sent. In the example shown in FIG. 2, the image area 211 of one frame has a rectangular shape and is included in the entire area of the display 201. In this case, the display device 200 shown in FIG. 1 includes a rectangular display unit 212 as in the conventional case. One frame image is all displayed on the display unit 212. The other areas 213 _{1 to} 213 ₄ of the display 201 are actually masked and are not useful for display. Therefore, the display 201 can be manufactured by omitting all or part of these regions 213 _{1 to} 213 ₄ .

  In the example shown in FIG. 3, in order to display an image in the entire area of the display 201, the entire display area of the display 201 is included in one rectangular image area 214. In this way, an image can be displayed on the display 201 of the present embodiment using the conventional rectangular frame image as it is.

FIG. 4 shows a case where each frame of the video signal has a circular shape. A photoelectric conversion element having the same arrangement as the display cell in the display described later is used, or the length of each scanning line S ₁ , S ₂ , S ₃ ,... Is moved from the upper end P _S to the lower end P _E of the circle. Accordingly, by setting the length of the circular frame 215 to be cut in the horizontal direction, a circular frame image by raster scanning can be obtained.

FIG. 5 shows the arrangement of display cells in a circular display. However, in this figure, the size of the display cell is drawn relatively large with respect to the display 201. As shown in this figure, the display 201 has a circular center display cell 221 at the center thereof. Let R be the radius of the center display cell 221. A concentric circle having a radius of 2R is drawn outside the center display cell 221, and a ring-shaped region sandwiched between the concentric circle and the outer periphery of the center display cell 221 passes through the center of the center display cell 221. Each of the display cells when divided by 22.5 degrees into 16 is defined as the first peripheral display cell 222 (222 _{1 to} 222 ₁₆ ). Also, the 16 outside of the first round display cell 222 ₁ to 222 _16, drawing a concentric radius 3R, sandwiched between the outer circumference of the concentric circle and 16 of the first lap display cell 222 ₁ to 222 ₁₆ Each of the display cells when the ring-shaped region is divided into 16 equal portions of 22.5 degrees by the above-described line segments is defined as a second peripheral display cell 223 (223 _{1 to} 223 ₁₆ ). The same applies hereinafter.

However, the size of each display cell, that is, the length of the circular arc in the circumferential direction increases as it goes to the outer periphery of the display 201. As a result, the resolution of the image in the direction of the arc or in the circumferential direction decreases as the resolution is outside the display 201. Therefore, in order to eliminate such inconvenience, in the display 201 of the present embodiment, in the example shown in FIG. 5, the line segment described above is provided outside the seventh round display cell 228 (228 _{1 to} 228 ₁₆ ). By dividing into 16 parts and further dividing into 16 parts at the intermediate positions of these line segments, eighth round display cells 229 (229 _{1 to} 229 ₃₂ ) each divided into 11.25 degrees and 32 parts are arranged. The same applies to the following. After the display area is arranged by dividing the ring-shaped area into 32 in this way, the ring-shaped area (not shown) outside the area is divided into 64 areas if necessary. Become. The same applies hereinafter.

The display 201 having the display cells 221, 222, 223,... Arranged as described above has an angle θ represented by the following equation (1), where N is the number of divisions obtained by dividing the ring-shaped region at the outermost periphery. A thin line can be displayed at a rotation angle with a minimum unit of.
θ = 360 ÷ N (1)

For example, in the display 201 having the same configuration as that of FIG. 5 and the outermost fourteenth display cell 235 (235 _{1 to} 235 ₃₂ ) of the center display cell 221 being divided into 32, the thin line is rotated at an angle of 11.25 degrees. Can be expressed. Of course, in many display devices used in actual devices, each display cell is very small, and the number of divisions N is usually much larger than the example shown in FIG. Therefore, with such a display, it is possible to display fine lines at a finer rotation angle than in the example shown in FIG.

  FIG. 6 shows a vertical line segment in the display shown in FIG. 5, and FIG. 7 shows a line segment rotated 11.25 degrees clockwise from FIG. The two adjacent line segments 231 and 232 are expressed as continuous pixels that are not interrupted.

  Next, some examples of application of the display device of the present invention to products will be described.

  <First application example>

  8 and 9 show examples in which the display device of the present invention is applied as a sub-display of a mobile phone. The sub-display 302 of the foldable mobile phone 301 has a circular shape and is composed of liquid crystal or organic EL. In a normal case, an analog type clock displays hours, minutes, and seconds on the sub-display 302 as shown in FIG. Since the sub display 302 uses the circular display 201 shown in FIG. 5, even the thin second hand 303 can be displayed with high quality.

  FIG. 9 shows an example in which the orientation is displayed on the sub display 302 of the same mobile phone 301. This cellular phone 301 includes a geomagnetic sensor (not shown), and can display the direction in the direction display mode, similar to a compass using a magnet. Subtle azimuth changes are also possible by using the sub-display 302.

  <Second application example>

  FIG. 10 shows an example in which the display device of the present invention is applied to a wristwatch. The circular display 312 of the wrist watch 311 is composed of liquid crystal or organic EL. This portion uses the circular display 201 shown in FIG. The wristwatch 311 includes a gravity sensor (not shown) that detects the direction of gravity and a temperature sensor that detects body temperature. Therefore, even if the wristwatch is removed and the dial is arranged in a state where it is rotated by about 90 degrees as shown in FIG. 10, the display information on the watch is rotated so that the mark 313 at noon always faces upward. Thus, the display form can be changed.

In other words, when the user removes the wristwatch 311 from the arm and the temperature sensor detects a decrease in temperature, the gravity sensor detects the direction of gravity, and the circular mark is arranged so that the mark 313 at noon is arranged in the opposite direction. Rotate the image. Since the circular display 201 shown in FIG. 5 does not deteriorate the image quality even when the image is rotated around the center of the circle, the analog display watch is raised like the sub display 302 of the mobile phone 301 shown in FIG. It can be displayed in quality.
<Third application example>

  FIG. 11 shows a case where the present invention is applied to a head mounted display device. A head mounted display device 323 having a display 322 disposed in front of the right eye is attached to the head of the user 321. The head mounted display device 323 stores a video processing unit which will be described below, and sends a video signal received by the antenna 324 to the display 322 to output a video. The display 322 is in principle the same display as the circular display 201 shown in FIG.

  FIG. 12 shows the configuration of the video processing unit. The video processing unit 331 detects a video frame composed of a tilt detection sensor 332 that detects the tilt of the face and the video signal 333 sent from the antenna 324 shown in FIG. 11 according to the tilt angle detected by the tilt detection sensor 332. A video rotation circuit 334 that rotates and a display drive circuit 335 that displays a video frame whose rotation has been corrected by the video rotation circuit 334 on a display 322 are provided. Therefore, for example, when the inclination detection sensor 332 detects the inclination of the angle θ around the pupil 103 (see FIG. 14) when the face surface is kept vertical, the video rotation circuit 334 detects the video frame by this inclination. Rotate. Thereby, the user can hold the vertical direction and the horizontal direction in the image regardless of the rotation of the face.

  The various application examples described above are examples, and it is natural that the present invention can be applied to various uses. Of course, the display device of the present invention can display not only monochrome but also color.

  Further, in the embodiment, as shown in FIG. 5, the display cells are arranged so as to be divided into 16 at the center and sequentially increase the number of divisions by two. However, the initial number of divisions and further the outer circumference of the circumference are arranged. The rate of increase in the number of divisions when heading is not limited to this. For example, various modifications can be made such that the display cell is arranged so that it is divided into 10 at the center and the number of divisions is sequentially increased by 3 times.

FIG. 13 is a diagram for explaining a general display arrangement structure based on the present invention. In the display 400 of the present invention, a first display cell 401 having a circular shape with a radius a is arranged at the center. It is assumed that concentric circles 411, 412,... Exist at positions where the length increases by a length b from a position away from the center of the first display cell 401 by a radius a (positions away from the center). . At this time, each of the ring-shaped regions 421, 422,... Partitioned by the first c (c is an integer of 1 or more) concentric circles outside the first display cell 401 (d is 2). The display integers individually arranged in the respective sections when equally divided by straight lines 431 ₁ , 431 ₂ ,... 431 _d each having a predetermined angle θ at the center of the first display cell. The cell is a second display cell 402. For example, a ring-shaped region partitioned by the outer peripheral portion concentric 411 of the first display cell 401, linear 431 _1, 431 _2, the results obtained by equally dividing by ...... 431 _d, the second d items in this region Display cell 402 exists. In FIG. 13, since the value of c is three, there are 3d second display cells 402 in total on the display 400.

On the outer side of the c concentric circles, every two contiguous circles having the same interval as the concentric circles and e adjacent concentric circles (e is an integer of 1 or more) are drawn adjacent to each other at the center of the first display cell 401. Are divided by equal angles (θ / (f + 1)) by f lines (f is an integer equal to or greater than 1) with the center as one end, so that a straight line adjacent to the concentric circle by a numerical value (f + 1). When the number of partitions partitioned by is increased, the third display cell 403 is arranged in each increased partition. In FIG. 13, the value of e is 3 and the value of f is 2. As a result, the total number of the third display cells 403 by drawing the first e concentric circles is expressed by the following formula in the case of FIG.
(F + 1) × d × e

In the case of the example shown in FIG. 5, each value is as follows.
a = b
c = 7
d = 16
e = 7 (repeated once)
f = 1

It is a schematic block diagram showing the outline | summary of the display apparatus in one Example of this invention. It is explanatory drawing showing the relationship between the display area of a display in case a display part is a rectangle, and the image of 1 frame. It is explanatory drawing showing the relationship between the display area of a display in case a display part is circular, and the image of 1 frame. It is explanatory drawing showing the mode of the raster scan in case each flame | frame of a video signal is circular. It is the top view which showed arrangement | positioning of the cell for a display in a circular display. It is explanatory drawing which showed a mode that the line segment with a perpendicular direction was displayed on the display shown in FIG. It is explanatory drawing which showed a mode that the line segment rotated 11.25 degree | times clockwise from FIG. 6 is displayed. FIG. 6 is a plan view of a foldable mobile phone on which a timepiece is displayed as a first application example of the present invention. FIG. 6 is a plan view of a folding mobile phone on which a compass is displayed as a first application example of the present invention. It is a principal part front view of the wristwatch as the 2nd example of application of the present invention. It is a front view showing the state which mounted | wore the user's head with the head mounted display apparatus as the 3rd application example of this invention. It is a block diagram showing the structure of the video processing part in this 3rd application example. It is explanatory drawing of the general structure of the display of this invention. It is a front view of a human eye. It is a top view showing the thin line of the horizontal direction when the cell for a display is arrange | positioned at matrix form. It is a top view showing the thin line of the 45 degree | times rotation direction when the cell for a display is arrange | positioned at matrix form. It is a principal part top view showing the state where the cell for display by the conventional proposal was combined. It is explanatory drawing which showed a part of straight line showing the intermediate direction of the two broken lines 133 and 134 in FIG.

Explanation of symbols

200 Display Device 201, 312, 322 Display 202 Drive Circuit 204 Signal Input Circuit 221 Center Display Cell 222 First Round Display Cell 223 Second Round Display Cell 224 Third Round Display Cell 225 Fourth Round Display Cell 226 5th display cell 227 6th display cell 228 7th display cell 229 8th display cell 230 9th display cell 231 10th display cell 232 11th display cell 233 12-round display cell 234 13-th round display cell 235 14-th round display cell 302 Sub-display 332 Tilt detection sensor 334 Video rotation circuit 335 Display drive circuit

Claims (6)

A first display cell having a circle with a radius a arranged in the center;
When it is assumed that concentric circles with respect to the circle of the radius a exist at respective positions in the direction away from the center of the first display cell by the radius a by a length b (b is an arbitrary positive value). In addition, the first c cells (c is an integer greater than or equal to 1) concentric circles separated from the first display cell by the respective ring-shaped regions at an equal angle to each other. A second display cell arranged individually in each section when divided by d straight lines (d is an integer of 2 or more) having one end at the center;
Each time two e adjacent concentric circles are drawn on the outer side of the c concentric circles with the same interval as the concentric circles (e is an integer of 1 or more), two adjacent ones each having the center of the first display cell as one end. By dividing the ring-shaped region between the straight lines by new f lines (f is an integer of 1 or more) with the same angle at the center of the first display cell as one end, a numerical value ( A display comprising: e + 1 concentric circles by f + 1) and a third display cell arranged in each of the increased partitions when the partitions partitioned by these straight lines are increased. . A display according to claim 1;
A display device comprising: display driving means for independently driving the first to third display cells of the display according to image data at corresponding positions. A display according to claim 1;
Rotation angle detecting means for detecting the rotation angle of the first display cell of the display;
Display driving means for independently driving the first to third display cells of the display according to image data at corresponding positions;
A display device comprising: image data correction means for performing correction for rotating the image data in the reverse direction by an angle corresponding to the rotation angle detected by the rotation angle detection means. A display according to claim 1;
Gravity direction detecting means for detecting the gravity direction of the display;
Display driving means for independently driving the first to third display cells of the display according to image data at corresponding positions;
A display device comprising: image data correction means for performing correction to rotate image data so that the gravity direction detected by the gravity direction detection means coincides with the gravity direction of the image data.   The display device according to claim 2, wherein the display is incorporated in a portable terminal as a display other than the main display.   The display device according to claim 5, further comprising a geomagnetic sensor, wherein a compass is displayed on a display other than the main display based on a detection result of the geomagnetic sensor.

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